Designed for use in a Siemens Modular (or FireFinder) system, Model REMBOX4 has four inner door module spaces. Any combination of central processor units (two module spaces), switch module brackets, LVMs or FMTs (one module space each) can be used. Unused module spaces can be covered with Model ID-SP blank plates. Model REMBOX4 can also mount a single RNI remote network interface on a bracket included in the backbox. A bracket called the REMBOX4 MP can be used to mount up to eight (8) variations of Model OCM-16 output control modules and Model SIM-16 supervised input modules. Model REMBOX4-MP must be purchased separately.